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Everyone at Hogwarts knows Seraphina Ashbourne. The elegant heiress. The perfect daughter. The girl who has spent years being exactly what society expected. What they don't know is that she has a younger sister. Y/N Ashbourne has been homeschooled, hidden away from pure-blood society, and left entirely to her own chaotic devices. Until now. Sent to Hogwarts for her seventh year, Y/N arrives late, out of uniform, covered in tattoos, and completely uninterested in anyone's opinion. She isn't looking for popularity. She isn't looking for romance. She's just here to have fun. Unfortunately, Hogwarts has other plans. Especially one particular Slytherin who can't seem to stop noticing her. (original main characters added, read story details)